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[3.10] bpo-28516: document contextlib.ExitStack.__enter__ behavior (GH-31636) #32171

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Merged
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Mar 29, 2022
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[3.10] bpo-28516: document contextlib.ExitStack.__enter__ behavior (GH-31636) #32171

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3 changes: 3 additions & 0 deletions Doc/library/contextlib.rst
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Expand Up @@ -485,6 +485,9 @@ Functions and classes provided:
# the with statement, even if attempts to open files later
# in the list raise an exception

The :meth:`__enter__` method returns the :class:`ExitStack` instance, and
performs no additional operations.

Each instance maintains a stack of registered callbacks that are called in
reverse order when the instance is closed (either explicitly or implicitly
at the end of a :keyword:`with` statement). Note that callbacks are *not*
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